I have a 2011 BMW 550i, the dealership says in the front I have 8.5" 33, and in the rear I have 9" 44, the aftermarket rims I want say the front is 9" and 35, the rear is 10" and 38, the wheel place says this will work, but the dealership doesnt know...does anyone else know if they will give me any problems, both sets of rims are 19" and the tires will be the same.

I am no wheel expert but generally speaking you dont want to change the distance inwards or outwards more than 10-12mm. Fronts will be 8mm deeper to the inside and stick out 4 mm while rears will be 7 mm deeper to the inside and stick out by 19 mm. From this calculation it seems like a bit too mch. I would wait for someone more experienced than I am to comment on the numbers.